A piper PA31 on approach for landing at 1500 ft declared an emergency due to the right main landing gear unsafe light on caused by a failed spring loaded downlock.

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Attributes
ACN	412625
Time
Date	199808
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : psm
State Reference	NH
Altitude	agl bound lower : 0 agl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : psm
Operator	common carrier : air taxi
Make Model Name	PA-31 Navajo Chieftan/Mojave/Navajo T1020
Operating Under FAR Part	Part 135
Flight Phase	descent : approach landing other other
Flight Plan	VFR
Person 1
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 130 flight time total : 6350 flight time type : 500
ASRS Report	412625
Person 2
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Right main gear indicated not locked. All avenues were taken to lock gear. Landed psm, saw downlock resting on brace (not locked). I pushed downlock over brace and all indications were normal (down and locked visually and cockpit indications). I wrote up the airplane and called the company on call maintenance a&P. He said to fly the plane gear down to bdr. I did. Callback conversation with reporter revealed the following information: the reporter stated the aircraft landed ok but on inspection of the right main gear the downlock had failed and the downlock was out of position. The reporter said by pushing on the downlock it slipped into the lock position. The reporter stated the aircraft was then maintenance ferried gear down to be repaired.

Original NASA ASRS Text

Title: A PIPER PA31 ON APCH FOR LNDG AT 1500 FT DECLARED AN EMER DUE TO THE R MAIN LNDG GEAR UNSAFE LIGHT ON CAUSED BY A FAILED SPRING LOADED DOWNLOCK.

Narrative: R MAIN GEAR INDICATED NOT LOCKED. ALL AVENUES WERE TAKEN TO LOCK GEAR. LANDED PSM, SAW DOWNLOCK RESTING ON BRACE (NOT LOCKED). I PUSHED DOWNLOCK OVER BRACE AND ALL INDICATIONS WERE NORMAL (DOWN AND LOCKED VISUALLY AND COCKPIT INDICATIONS). I WROTE UP THE AIRPLANE AND CALLED THE COMPANY ON CALL MAINT A&P. HE SAID TO FLY THE PLANE GEAR DOWN TO BDR. I DID. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT LANDED OK BUT ON INSPECTION OF THE R MAIN GEAR THE DOWNLOCK HAD FAILED AND THE DOWNLOCK WAS OUT OF POS. THE RPTR SAID BY PUSHING ON THE DOWNLOCK IT SLIPPED INTO THE LOCK POS. THE RPTR STATED THE ACFT WAS THEN MAINT FERRIED GEAR DOWN TO BE REPAIRED.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.